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Courtesy Lamps Malfunction




Courtesy Lamps Malfunction

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.

Diagnostic Fault Information





Circuit/System Description

The rear electrical center (REC) applies voltage to the cargo lamps and the I/P compartment lamp with individual control circuits. The REC applies voltage to the dome/reading lamps and the left and right vanity mirrors through the inadvertent courtesy lamp control circuit. In the event that the dome lamp, reading lamp, or vanity mirror lamp were to remain illuminated for more than 20 minutes with the ignition switch in the OFF position, the REC will deactivate the inadvertent courtesy lamp control circuit to prevent battery discharge. When any door is opened, the jam switch contacts close and the REC receives a door-open input. If the REC receives a door lock or unlock input or a rear hatch open input, the REC will apply voltage to the individual courtesy lamp control circuits illuminating the courtesy lamps. The dome lamps will illuminate when a door is opened with the dome lamp switch in the DOOR position only.


Reference Information
Schematic Reference

Interior Lights Schematics (Interior Lights Schematics)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Interior Lighting Systems Description and Operation (Interior Lighting Systems Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Testing

Cargo Lamp Malfunction
1. Ignition OFF, disconnect the harness connector at the inoperative cargo lamp.
2. Ignition OFF, exterior lamps OFF, test for less than 5.0 ohms between the ground circuit terminal 2 and ground.

• If greater than the specified range, test the ground circuit for an open/high resistance.

3. Connect a test lamp between the control circuit terminal 1 and ground.
4. Command the Trunk Lamp Test ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.

• If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the REC.
• If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the REC.

5. If all circuits test normal, replace the inoperative cargo lamp.

Dome/Reading Lamps Malfunction
1. Ignition OFF, disconnect the harness connector at the appropriate dome lamp.
2. Ignition OFF, test for less than 5.0 ohms between the appropriate ground circuit terminal listed below and ground.

* Dome lamp ground - front terminal 5
* Dome lamp ground - center terminal 1

• If greater than the specified range, test the ground circuit for an open/high resistance.

3. Ignition ON, verify a test lamp illuminates between the appropriate control circuit terminal listed below and ground.

* Dome lamp control - front terminal 6
* Dome lamp control - center terminal 2

• If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the REC.

4. Connect a test lamp between B+ and the appropriate control circuit terminal listed below.

* Dome lamp control - front terminal 7
* Dome lamp control - center terminal 4

5. Command the Interior Lamp Test ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.

• If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the REC.

• If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the REC.

6. If all circuits test normal, replace the appropriate dome lamp.

Door Courtesy Lamps Malfunction
1. Ignition OFF, disconnect the harness connector at the inoperative front door courtesy lamp.
2. Ignition OFF, test for less than 5.0 ohms between the ground circuit terminal 3 and ground.

• If greater than the specified range, test the ground circuit for an open/high resistance.

3. Connect a test lamp between the control circuit terminal 1 and ground.
4. Command the Interior Lamp Test ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.

• If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the appropriate front door window switch.

• If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the appropriate front door window switch.

5. If all circuits test normal, replace the inoperative front door courtesy lamp.

Instrument Panel (I/P) Compartment Lamp Malfunction
1. Ignition OFF, disconnect the harness connector at the I/P compartment lamp.
2. Ignition OFF, test for less than 1.0 ohm between the ground circuit terminal 1 and ground.

• If greater than the specified range, test the ground circuit for an open/high resistance.

3. Ignition ON, verify that a test lamp illuminates between the control circuit terminal 2 and ground.

• If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the REC.

4. If all circuits test normal, replace the I/P compartment lamp switch.

Vanity Mirror Lamps Malfunction
1. Ignition OFF, disconnect the harness connector at the inoperative vanity mirror.
2. Ignition OFF, scan tool OFF, interior lamps OFF, test for less than 1.0 ohm between the ground circuit terminal B and ground.

• If greater than the specified range, test the ground circuit for an open/high resistance.

3. Ignition ON, verify that a test lamp illuminates between the control circuit terminal A and ground.

• If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the REC.

4. If all circuits test normal, replace the inoperative vanity mirror.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Sunshade Replacement (Visor Cover) (Service and Repair)Sunshade Replacement (Visor) (Service and Repair)
* Cargo Lamp Replacement (Coupe) (Cargo Lamp Replacement (Coupe))Cargo Lamp Replacement (Sedan) (Cargo Lamp Replacement (Sedan))
* Dome Lamp Replacement (Dome Lamp Replacement)
* Headlamp Switch Replacement (Service and Repair)
* Instrument Panel Storage Compartment Lamp Replacement (Service and Repair)
* Overhead Console Reading Lamp and Bulb Replacement (Overhead Console Reading Lamp and Bulb Replacement)
* Automatic Transmission Range Selector Lever Replacement (Automatic Transmission Range Selector Lever Replacement)
* Control Module References (Programming and Relearning) for REC replacement, setup, and programming

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